Lattice doping regulated interfacial reactions in cathode for enhanced cycling stability

Lianfeng Zou, Jianyu Li, Zhenyu Liu, Guofeng Wang, Arumugam Manthiram () and Chongmin Wang ()
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Lianfeng Zou: Pacific Northwest National Laboratory
Jianyu Li: The University of Texas at Austin
Zhenyu Liu: University of Pittsburgh
Guofeng Wang: University of Pittsburgh
Arumugam Manthiram: The University of Texas at Austin
Chongmin Wang: Pacific Northwest National Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Interfacial reactions between electrode and electrolyte are critical, either beneficial or detrimental, for the performance of rechargeable batteries. The general approaches of controlling interfacial reactions are either applying a coating layer on cathode or modifying the electrolyte chemistry. Here we demonstrate an approach of modification of interfacial reactions through dilute lattice doping for enhanced battery properties. Using atomic level imaging, spectroscopic analysis and density functional theory calculation, we reveal aluminum dopants in lithium nickel cobalt aluminum oxide are partially dissolved in the bulk lattice with a tendency of enrichment near the primary particle surface and partially exist as aluminum oxide nano-islands that are epitaxially dressed on the primary particle surface. The aluminum concentrated surface lowers transition metal redox energy level and consequently promotes the formation of a stable cathode-electrolyte interphase. The present observations demonstrate a general principle as how the trace dopants modify the solid-liquid interfacial reactions for enhanced performance.

Date: 2019
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DOI: 10.1038/s41467-019-11299-2

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